利用java操作Excel表格（把Excel中的数据导入数据库中）

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myeclipse中要先导入POI包（网上有下载的）。再选择lib文件夹，右击选择import将这个包import进来。

1.编写数据库链接类

Java代码

package com.zzg.db;

import java.sql.Connection;

import java.sql.DriverManager;

public class DbUtils {

private static Connection conn;

static {

try {

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection("jdbc:mysql://localhost/test","root","123456");

} catch (Exception e) {

e.printStackTrace();

}

}

public static Connection getConn() {

return conn;

}

public static void setConn(Connection conn) {

DbUtils.conn = conn;

}

}

2.编写数据库操作类

Java代码

package com.zzg.db;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.SQLException;

public class ExcuteData {

private PreparedStatement pstmt;

public boolean ExcuData(String sql) {

Connection conn = DbUtils.getConn();

boolean flag=false;

try {

pstmt = conn.prepareStatement(sql);

flag=pstmt.execute();

} catch (SQLException e) {

e.printStackTrace();

}

return flag;

}

}

3.编写Excel表格实体类

Java代码

package com.zzg.model;

public class TableCell {

private String _name;

private String _value;

public String get_name() {

return _name;

}

public void set_name(String _name) {

this._name = _name;

}

public String get_value() {

return _value;

}

public void set_value(String _value) {

this._value = _value;

}

}

4.编写主键生成方法

Java代码

package com.zzg.util;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Random;

public class GenericUtil {

public static String getPrimaryKey()

{

String primaryKey;

primaryKey = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());

Random r = new Random();

primaryKey +=r.nextInt(100000)+100000;

return primaryKey;

}

}

5.编写Excel操作类

Java代码

package com.zzg.deployData;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.Serializable;

import java.util.ArrayList;

import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import com.zzg.db.ExcuteData;

import com.zzg.model.TableCell;

import com.zzg.util.GenericUtil;

public class OperExcel<T extends Serializable> {

private HSSFWorkbook workbook;

private String tableName;

private Class<T> type;

private String sheetName;

public OperExcel(File excelFile, String tableName, Class<T> type,

String sheetName) throws FileNotFoundException,

IOException {

workbook = new HSSFWorkbook(new FileInputStream(excelFile));

this.tableName = tableName;

this.type = type;

this.sheetName = sheetName;

InsertData();

}

// 向表中写入数据

public void InsertData() {

System.out.println("yyy");

ExcuteData excuteData = new ExcuteData();

List<List> datas = getDatasInSheet(this.sheetName);

// 向表中添加数据之前先删除表中数据

String strSql = "delete from " + this.tableName;

excuteData.ExcuData(strSql);

// 拼接sql语句

for (int i = 1; i < datas.size(); i++) {

strSql = "insert into " + this.tableName + "(";

List row = datas.get(i);

for (short n = 0; n < row.size(); n++) {

TableCell excel = (TableCell) row.get(n);

if (n != row.size() - 1)

strSql += excel.get_name() + ",";

else

strSql += excel.get_name() + ")";

}

strSql += " values (";

for (short n = 0; n < row.size(); n++) {

TableCell excel = (TableCell) row.get(n);

try {

if (n != row.size() - 1) {

strSql += getTypeChangeValue(excel) + ",";

} else

strSql += getTypeChangeValue(excel) + ")";

} catch (RuntimeException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

}

//执行sql

excuteData.ExcuData(strSql);

}

}

/**

* 获得表中的数据

* @param sheetName 表格索引(EXCEL 是多表文档,所以需要输入表索引号)

* @return 由LIST构成的行和表

*/

public List<List> getDatasInSheet(String sheetName) {

List<List> result = new ArrayList<List>();

// 获得指定的表

HSSFSheet sheet = workbook.getSheet(sheetName);

// 获得数据总行数

int rowCount = sheet.getLastRowNum();

if (rowCount < 1) {

return result;

}

// 逐行读取数据

for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) {

// 获得行对象

HSSFRow row = sheet.getRow(rowIndex);

if (row != null) {

List<TableCell> rowData = new ArrayList<TableCell>();

// 获得本行中单元格的个数

int columnCount = sheet.getRow(0).getLastCellNum();

// 获得本行中各单元格中的数据

for (short columnIndex = 0; columnIndex < columnCount; columnIndex++) {

HSSFCell cell = row.getCell(columnIndex);

// 获得指定单元格中数据

Object cellStr = this.getCellString(cell);

TableCell TableCell = new TableCell();

TableCell.set_name(getCellString(

sheet.getRow(0).getCell(columnIndex)).toString());

TableCell.set_value(cellStr == null ? "" : cellStr

.toString());

rowData.add(TableCell);

}

result.add(rowData);

}

}

return result;

}

/**

* 获得单元格中的内容

*

* @param cell

* @return result

*/

protected Object getCellString(HSSFCell cell) {

Object result = null;

if (cell != null) {

int cellType = cell.getCellType();

switch (cellType) {

case HSSFCell.CELL_TYPE_STRING:

result = cell.getStringCellValue();

break;

case HSSFCell.CELL_TYPE_NUMERIC:

result = cell.getNumericCellValue();

break;

case HSSFCell.CELL_TYPE_FORMULA:

result = cell.getNumericCellValue();

break;

case HSSFCell.CELL_TYPE_ERROR:

result = null;

break;

case HSSFCell.CELL_TYPE_BOOLEAN:

result = cell.getBooleanCellValue();

break;

case HSSFCell.CELL_TYPE_BLANK:

result = null;

break;

}

}

return result;

}

// 根据类型返回相应的值

@SuppressWarnings("unchecked")

public String getTypeChangeValue(TableCell excelElement)

throws RuntimeException, Exception {

String colName = excelElement.get_name();

String colValue = excelElement.get_value();

String retValue = "";

if (colName.equals("id")) {

retValue = "'" + GenericUtil.getPrimaryKey() + "'";

return retValue;

}

if (colName == null) {

retValue = null;

}

if (colName.equals("class_createuser")) {

retValue = "yaa101";

return "'" + retValue + "'";

}

retValue = "'" + colValue + "'";

return retValue;

}

}

6.编写调用操作Excel类的方法

Java代码

package com.zzg.deployData;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

public class DeployData {

private File fileOut;

public void excute(String filepath) {

fileOut = new File(filepath);

this.deployUserInfoData();

}

public void deployUserInfoData() {

try {

new OperExcel(fileOut, "test", Object.class, "Sheet1");

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

7.编写客户端

Java代码

package com.zzg.client;

import com.zzg.deployData.DeployData;

public class DeployClient {

public static void main(String[] args) {

DeployData deployData = new DeployData();

deployData.excute("D://test.xls");

}

}

心得和修改：

因为excel表会导入到数据库中，所以表格实体类可以用hibernate的方法自动生成（变量名均和数据库她table中的字段名相同）